Refactor sources

app/logical/nico_seiga_api_client.rb

@@ -12,6 +12,8 @@ class NicoSeigaApiClient
     resp = HTTParty.get(uri, Danbooru.config.httparty_options)
     if resp.success?
       parse_illust_xml_response(resp.body)
+    else
+      raise HTTParty::ResponseError.new(resp)
     end
   end
 
@@ -20,6 +22,8 @@ class NicoSeigaApiClient
     resp = HTTParty.get(uri, Danbooru.config.httparty_options)
     if resp.success?
       parse_artist_xml_response(resp.body)
+    else
+      raise HTTParty::ResponseError.new(resp)
     end
   end
 
@@ -34,6 +38,6 @@ class NicoSeigaApiClient
     @image_id = image["id"].to_i
     @user_id = image["user_id"].to_i
     @title = image["title"]
-    @desc = image["description"]
+    @desc = image["description"] || image["summary"]
   end
 end